[llvm-bugs] [Bug 31842] New: -Wnull-conversion warnings are no longer reported for `char c = NULL`

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31842

            Bug ID: 31842
           Summary: -Wnull-conversion warnings are no longer reported for
                    `char c = NULL`
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: cpeterson at mozilla.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following program used to report a -Wnull-conversion warning with whatever
clang version Apple was shipping in 2012:

  warning: implicit conversion of NULL constant to 'char' [-Wnull-conversion]

I noted this in a Firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=778984

With the latest clang version Apple is shipping (Apple LLVM version 8.0.0
(clang-800.0.42.1, Target: x86_64-apple-darwin16.4.0), the following program
produces no warnings, even with clang -Weverything:


#include <stdlib.h>

int main()
{
  bool b = NULL; (void) b;
  char c = NULL; (void) c;
  int i = NULL; (void) i;
  return 0;
}

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